Lungs develop last in a baby. An early birth, without suitable medical care, means death.
There are NO necessary abortions. By definition during an abortion the baby is killed before he is extracted. They either scramble their little brains or chop them to bits.
There is simply no situation in which the health of the mother is in such a precarious position that you need to abort, and yet you have time to waste killing the baby.
There are only necessary unplanned deliveries.